Nxosv9k-7.0.3.i7.4.qcow2 (Best Pick)

The file name itself tells a history:

This is the most common use case for the qcow2 variant. Users download this specific image to lab complex topologies. nxosv9k-7.0.3.i7.4.qcow2

If your automation uses Ansible, NAPALM, or Netmiko to push configs to NX-OS, a virtual N9K allows safe regression testing. The 7.0.3.I7.4 image supports RESTCONF and NETCONF (though not fully OpenConfig compliant). The file name itself tells a history: This